Long description: TrigFig14
Alt text: A sequence of three diagrams illustrating trigonometric function values at angles of 180 degrees, between 180 and 270 degrees, and 270 degrees.
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- The first diagram shows a circle with an angle indicated, corresponding to an angle of 180 degrees, with the cosine value given as negative one and the sine value given as zero.
- The second diagram shows a circle with an angle \(\theta\) measured in the third quadrant, between 180 degrees and 270 degrees, with the cosine value labeled as \(OQ\) (negative) and the sine value labeled as \(OR\) (negative).
- The third diagram shows a circle with an angle indicated, corresponding to an angle of 270 degrees, with the cosine value labeled as \(\cos \theta = ?\) and the sine value labeled as \(\sin \theta = ?\).